diff --git a/json_to_md.py b/json_to_md.py
index b80136e3..6765158b 100644
--- a/json_to_md.py
+++ b/json_to_md.py
@@ -36,16 +36,22 @@ def extract_param_str_from_nodeid(nodeid):
     return None
 
 def get_details_block(summary, body, level=0, params_str=None):
-    margin = 18 * level
-    border = f"border-left: 2px solid #eee;" if level > 0 else ""
-    # Affiche les paramètres dans le résumé si présent
+    margin = 20 * level
+    border = "border-left: 2px solid #ccc;" if level > 0 else ""
+    style = f"margin-left: {margin}px; {border} padding-left: 10px;"
+
     if params_str:
-        summary = f"{summary} <span style='color: #888; font-size: 0.9em;'>parameters: [{params_str}]</span>"
-    return (f'<div style="margin-left: {margin}px; {border} padding-left: 8px;">\n'
-            f"<details>\n<summary>{summary}</summary>\n\n"
-            f"{body}\n"
-            f"</details>\n"
-            f"</div>\n\n")
+        summary += f' <span style="color: #888; font-size: 0.9em;">parameters: [{params_str}]</span>'
+
+    return (
+        f'<div style="{style}">\n'
+        f'  <details open>\n'
+        f'    <summary>{summary}</summary>\n\n'
+        f'{body}\n'
+        f'  </details>\n'
+        f'</div>\n\n'
+    )
+
 
 
 def make_test_block(test, status, emoji, level):